Metallic alloy



Patented June 2, 1925.

UNITED' STATES FRANK S. HODSON, G'F PHILADELPHIA, PENNSYLVANIA.

METALLIC ALLOY.

No Drawing.

To all whom it may concern:

Be it known that I, FRANK S. HoDsoN, a citizen of the United 'States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Metallic Alloys, of which the following is aspecification.

The main object of my present inventionbase alloy which has a tensile strength of upwards of 55,000 lbs. to the square inch and a Brinnell hardness of over 90.

In the production of my improved metallic alloy, I preferably make a hardening alloy of substantially equal parts of aluminum and copper.

As a specific illustration I use 51. parts aluminum, 49. parts copper, 1. part manganese, and .5 part titanium.

I then use sufficient of the above mentioned hardening alloy to keep within the range of proportionate amounts of elements specified, said elements ranging in the following proportions: zinc 77. to 87. parts; aluminum, 10. to 20. parts; copper, 2.01 to 8.50 parts.

In carrying out the process of obtaining my improved alloy I adopt the principle and take into consideration the fact that aluminum and copper alloyed in the above ratio for the hardening alloy, when remelted has a lower melting point'than aluminum itself.

The hardening alloy is preferably poured into ingots and is used when necessary by adding it into the normal aluminum content s nce this harden-mg alloy re-melts at a lower melting point than that of the aluminum itself and I thereby introduce the Application filed October 7, i920. SerialNo. 415,267.

' copper content into the alloy and thus avoid the superheating of the large aluminum content.

A specific example of the production of my metallic alloy is as follows :--To a normal molten aluminum content of 12.25 parts is added 5 parts of the above mentioned hardening alloy; the resulting co-mixture being added to 83 parts of a molten zinc content.

As above specified and owing to the atfinity of both aluminum and zinc for oxygen, (particularly While molten,) I prefer to use manganesevand titanium or magnesium in small quantities to remove the occluded oxygen in the molten mass since any of these three elements have a greater affinity for oxygen than either the aluminum or zinc and a small quantity of manganese and titaniumor magnesium will reduce the oxides during the time the mass is'in a molten state. In this zinc base al1oy I have secured a tensile strength equal to the tensile strength of some grades of manganese bronze and it is an alloy that can be cast under pressure in a steel die or mold which cannot be done commercially with manganese bronze owing tothe high melting point and: consequent erosion of the steel die by the manganese or any other brass or bronze alloy.

In making the alloy of my present invention I prefer to use both the aluminum and zinc as free of impurities as commercially possible to do so. For example I prefer to use zinc not having more'than 1.5 per cent of impurities which sometimes consist of lead, cadmium, iron, etc. I

Having thus described my invention, what I claim as new and desire to secure by Let-- ters Patent is 1. The method of making a metallic alloy which consists in first making a hardening alloy of approximately 51partsaluminum, 49-parts copper. one part. manganese and one half part titanium; adding approximately 5 parts of the hardening alloy to approxin'iately 12% parts of molten aluminum, and adding this co-mixture to approximately 83 parts of molten zinc.

2. A. zinc base alloy adapted for use in making castings and hot-pressed forgings having a tensile strength of 55,000,pounds or more to the square inch and a Brinnell hardness of over. 90, the alloy consisting of from 77 to 87 parts zinc, 10 to 20 parts aluminum, 2 to 8.50 parts copper, about 1 part manganese and one half part titanium, the copper, manganese and titanium having first been fused with an equalquantity of aluminum to form a hardening alloy, this mixture fused with the remaining aluminum Content and the second mixture fused with the zinc content.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

FRANK S. HODSON. Witnesses CHAS. E. Po'r'rs, AUGUSTUS B. Corrns. 

